Of course I believe everyone has a right to enjoy their own personal favourite, but I can't help feeling that Americans complicate their ice-creams too much. Not an allegorical statement - I've decided to take the question at face value
Ben & Jerry's? Faugh. Always seems to have something in it that I don't like - usually some form of nuts or cake product. Or bananas, which everyone knows are the devil's favourite food.
Probably not fair of me to make it a US issue - I find Pret a Manger (Brit sandwich shop) does the same - cucumber in just about everything for example, and I can't bear the stuff. Even if I don't taste it at the time I burp up the flavour all evening.
My all time favourite would be a simple, plain, good quality vanilla. For fancy ice cream I'd have a Haagen Daaz Vanilla Chocolate Fudge (rich vanilla with seams of chocolate and fudge). And yes, I know they're American too